Proportional pressure valve with self-adaptive reverse prevention function

Abstract

The present application relates to the field of pressure valve, specifically to a proportional pressure valve with self-adaptive reverse stopping function, comprising a valve body and a valve core, the valve body is provided with a first outlet and a second outlet penetrating through the inside thereof, the valve core is provided with a flow channel, the valve body and the valve core form annular valve cavities communicated with the two outlets respectively, each annular valve cavity is provided with a reverse stopping structure, the reverse stopping structure comprises a fixed valve sleeve and a rotating valve sleeve, the fixed valve sleeve is provided with an inner hole, the rotating valve sleeve is provided with an outer hole, a torsional spring is fixedly connected between the rotating valve sleeve and the fixed valve sleeve, and the rotating valve sleeve is provided with a pressure receiving part. The rotating valve sleeve and the fixed valve sleeve cooperate to trigger the rotation of the pressure receiving part under the high pressure of reverse flow to realize the misalignment closing between the inner hole and the outer hole, and simultaneously open the pressure relief channel to rapidly relieve pressure, and carry out primary reverse stopping, and cut off the inner hole and the flow channel by the pressure ring to carry out secondary reverse stopping, thereby improving the stability and safety of the proportional pressure valve under complex working conditions.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of pressure valves, in particular to a proportional pressure valve with self-adaptive reverse flow prevention function. BACKGROUND

[0002] In hydraulic and pneumatic control systems, proportional pressure valves are used to accurately regulate system pressure according to input signals, and are widely used in situations requiring high-precision pressure control. Existing proportional pressure valves mainly focus on the linearity and stability of pressure regulation, but in complex working conditions, especially when the system suddenly loses power, the load suddenly changes or there is a reverse pressure impact, they generally lack effective reverse flow prevention capability, which can easily cause downstream pressure to backflow, leading to misoperation of the actuator, system pressure fluctuations, and even equipment damage.

[0003] The currently disclosed Chinese patent with the authorization publication number CN214789233U is a pressure-stable pressure reducing valve, which includes a valve body, a valve core, and a throttling element. The valve body is provided with a flow passage, which includes an inlet section, a sliding section, and an outlet section connected in sequence. The valve core is slidably arranged in the sliding section, and the sliding direction of the valve core is the same as the transmission direction of the sliding section. The transmission direction of the inlet section is perpendicular to the sliding direction of the valve core. The valve core is provided with a communication hole for connecting the inlet section and the sliding section, and the inlet section is located on the sliding track of the communication hole. The outlet section is located on one side of the transmission direction of the sliding section, and the transmission direction of the outlet section is the same as the transmission direction of the sliding section. The throttling element is located on the side of the valve core away from the outlet section.

[0004] According to the above-mentioned patent, the valve core is driven to slide by the hydraulic pressure generated by the outlet section, which cuts off the inlet section and the sliding section, and has a reverse flow prevention function. However, the reverse flow prevention function relies on the valve core moving in the opposite direction to cut off the inlet section, and the response speed is affected by the change of downstream pressure, which has a lag and is difficult to quickly block the sudden reverse flow impact. Therefore, there is a need for a proportional pressure valve that can quickly respond to reverse flow conditions and has a self-adaptive reverse flow prevention function. SUMMARY

[0005] To solve the problems existing in the prior art, a proportional pressure valve with self-adaptive reverse flow prevention function is provided, which is triggered to rotate by the pressure part under the high pressure of reverse flow to realize the misalignment closing between the inner hole and the outer hole, and at the same time, the pressure relief channel is opened to quickly relieve pressure, which performs primary reverse flow prevention. In combination with the pressure ring cutting off the inner hole and the flow passage, secondary reverse flow prevention is performed, which improves the stability and safety of the proportional pressure valve in complex working conditions.

[0006] To solve the prior art problems, the application provides a proportional pressure valve with self-adaptive reverse stopping function, which comprises a valve body and a valve core slidingly arranged in the valve body, the valve body is provided with a first outlet and a second outlet penetrating through the inside of the valve body, the valve core is provided with a flow channel for switching the communication between the two outlets by moving, annular valve cavities communicated with the two outlets are respectively formed between the valve body and the valve core, a reverse stopping structure is arranged in each annular valve cavity, the reverse stopping structure comprises a fixed valve sleeve and a rotating valve sleeve, the fixed valve sleeve is coaxially arranged in the annular valve cavity and is fixedly connected with the valve body, the rotating valve sleeve is coaxially arranged on the fixed valve sleeve, an inner hole is formed in the fixed valve sleeve, an outer hole is formed in the rotating valve sleeve in a corresponding manner, the rotating valve sleeve can rotate relative to the fixed valve sleeve, a torsional spring is fixedly connected between the rotating valve sleeve and the fixed valve sleeve, the torsional spring is in an initial state without external force when the inner hole and the outer hole are coaxial, a pressure receiving part is arranged on the outer side of the rotating valve sleeve, and the pressure receiving part is arranged corresponding to the outlet, when the reverse pressure generated by the reverse flow at the outlet side acts on the pressure receiving part, the rotating valve sleeve is in a rotating state, so that the outer hole is misaligned with the inner hole and is closed.

[0007] Preferably, a pressure relief channel is arranged on the valve body corresponding to the position of each annular valve cavity, an annular plate is arranged on one end of the rotating valve sleeve facing the pressure relief channel and abutting the inner wall of the annular valve cavity, a pressure relief opening is formed in the annular plate, when the rotating valve sleeve rotates to make the pressure relief opening communicate with the pressure relief channel, the annular valve cavity is in a pressure relief state, and primary reverse stopping is formed.

[0008] Preferably, two sealing rings are arranged on the fixed valve sleeve and are in close contact with the inner wall of the rotating valve sleeve, annular grooves are formed in the outer wall of the fixed valve sleeve and the inner wall of the rotating valve sleeve for embedding the two sealing rings, and the two sealing rings are symmetrically arranged on both sides of the inner hole to form a bidirectional sealing interface.

[0009] Preferably, the pressure receiving part is a plate-shaped structure extending along the axial direction of the rotating valve sleeve, and the shape of the pressure receiving part is matched with the inner wall of the annular valve cavity.

[0010] Preferably, a plurality of first outlets and second outlets are arranged on the valve body and are spaced apart along the circumferential direction of the valve body, one pressure receiving part is arranged on each rotating valve sleeve corresponding to the position of each outlet, and a flow guide area matched with the corresponding outlet is formed between each two adjacent pressure receiving parts.

[0011] Preferably, a plurality of protrusions extending inward are uniformly distributed on the inner wall of the rotating valve sleeve, arc-shaped grooves coaxial with the annular valve cavity are formed in the outer wall of the fixed valve sleeve corresponding to the position of each protrusion, and each protrusion is slidingly connected in the corresponding arc-shaped groove to form a rotating limiting structure.

[0012] Preferably, the inner side of the fixed valve sleeve is provided with a ring sleeve sleeved on the valve core and fixedly connected with the valve body, a clamping layer is formed between the fixed valve sleeve and the ring sleeve, a compression ring and a compression spring fixedly connected therewith are arranged in the clamping layer, when the compression ring is positively pressed, the inner hole and the flow passage are in communication with each other, otherwise, the inner hole is in a closed state, forming a two-stage reverse stop.

[0013] Preferably, one end of the compression ring facing the flow passage is provided with a piston in sliding fit with the inner wall of the fixed valve sleeve and the outer wall of the ring sleeve, the inner wall of the fixed valve sleeve is provided with a step in fit with the piston, and a sealing ring in close contact with the outer wall of the compression ring is arranged on the step, when the piston is in contact with the step, the inner hole is in a fully open state.

[0014] Preferably, the fixed valve sleeve is provided with one inner hole corresponding to each outlet, and the rotating valve sleeve is provided with one outer hole corresponding to each inner hole.

[0015] Preferably, the valve body is provided with a plurality of pressure relief channels corresponding to the positions of each annular valve chamber, and the ring plate is provided with one pressure relief port corresponding to each pressure relief channel.

[0016] The beneficial effects of the present application compared with the prior art are:

[0017] 1. The present application realizes the self-adaptive reverse stop and stable pressure regulating function of the proportional pressure valve under the multi-outlet working condition through the cooperative fit of the rotating valve sleeve and the fixed valve sleeve in the annular valve chamber. Through the cooperative layout of the pressure receiving part and the flow guide area, the smooth forward flow is ensured and the rapid response is realized when the reverse flow occurs.

[0018] When the reverse high pressure occurs at the outlet, the pressure acts on the pressure receiving part to drive the rotating valve sleeve to rotate under the reverse pressure, the outer hole and the inner hole are quickly misaligned to be closed, and a bidirectional sealing barrier is formed in combination with the two sealing rings, effectively preventing internal and external leakage. The communication between the annular valve chamber and the flow passage is disconnected, and the safety, stability and service life of the proportional pressure valve under complex working conditions are improved.

[0019] 2. The present application realizes the effect of pressure relief of the annular valve chamber when the rotating valve sleeve rotates through the cooperation of the pressure relief channel and the pressure relief port. When the rotating valve sleeve rotates due to the reverse flow, the ring plate rotates synchronously, the pressure relief port and the pressure relief channel are aligned and communicated, and a multi-path parallel pressure relief path is formed.

[0020] The circumferential distribution of the plurality of pressure relief ports and pressure relief channels increases the flow area and improves the pressure relief efficiency, ensures the reverse stop effect, and prevents the internal pressure of the annular valve chamber from continuously rising. Through the fit of the outer periphery of the ring plate and the inner wall of the annular valve chamber, the opening and closing of the pressure relief channel is realized. The torsional spring is connected between the rotating valve sleeve and the fixed valve sleeve, so that after the reverse pressure is eliminated, the ring plate can be driven to rotate and reset, the pressure relief port and the pressure relief channel are misaligned and sealed again, and the flow is automatically restored.

[0021] 3. The present application moves the compression ring along the fixed valve sleeve in the axial direction, so that when the positive pressure acts on the front end of the compression ring, it pushes the compression ring to move and make the piston fit with the step, at this time the inner hole is connected with the flow channel, and full opening pressure supply is realized.

[0022] When the outlet backflow causes the pressure to reverse, the flow channel stops supplying pressure, the compression spring pushes the compression ring to reset, and the connection between the inner hole and the flow channel is closed. On the basis of one-stage backflow prevention, two-stage backflow prevention is formed, deep blocking of the internal flow channel is realized, backflow and reverse flow are effectively prevented, the backflow prevention effect of the proportional pressure valve is improved, and long-term stable operation is ensured. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 is a three-dimensional structural schematic diagram of a proportional pressure valve with self-adaptive backflow prevention function of the present application.

[0024] Figure 2 is a partial three-dimensional structural sectional view of a proportional pressure valve with self-adaptive backflow prevention function of the present application.

[0025] Figure 3 is a partial plane sectional view of a valve body, valve core and backflow prevention structure of a proportional pressure valve with self-adaptive backflow prevention function of the present application.

[0026] Figure 4 is a partial three-dimensional structural sectional view of a valve body, valve core and backflow prevention structure of a proportional pressure valve with self-adaptive backflow prevention function of the present application. Figure 1 .

[0027] Figure 5 is a partial three-dimensional structural sectional view of a valve body, valve core and backflow prevention structure of a proportional pressure valve with self-adaptive backflow prevention function of the present application. Figure 2 .

[0028] Figure 6 is a three-dimensional structural schematic diagram of a backflow prevention structure of a proportional pressure valve with self-adaptive backflow prevention function of the present application.

[0029] Figure 7 is an exploded three-dimensional structural schematic diagram of a backflow prevention structure of a proportional pressure valve with self-adaptive backflow prevention function of the present application.

[0030] Figure 8 is a partial three-dimensional structural sectional view of a valve body, valve core and backflow prevention structure of a proportional pressure valve with self-adaptive backflow prevention function of the present application. Figure 3 .

[0031] Figure 9 is a partial three-dimensional structural sectional view of a backflow prevention structure of a proportional pressure valve with self-adaptive backflow prevention function of the present application.

[0032] Figure 10is a planar sectional view of a reverse structure of a proportional pressure valve with self-adaptive reverse function.

[0033] The figure marks are: 1, valve body; 11, first outlet; 12, second outlet; 2, valve core; 21, flow channel; 22, annular valve cavity; 221, pressure relief channel; 23, tension spring; 24, electromagnetic driver; 241, electromagnetic push rod; 3, reverse structure; 31, fixed valve sleeve; 311, inner hole; 312, sealing ring; 313, arc-shaped groove; 32, rotating valve sleeve; 321, outer hole; 322, pressure receiving part; 323, ring plate; 3231, pressure relief port; 324, protruding block; 33, torsion spring; 4, ring sleeve; 41, pressure ring; 411, piston; 412, sealing ring; 42, compression spring. DETAILED DESCRIPTION

[0034] In order to further understand the features, technical means and specific purposes and functions achieved by the present application, the present application will be described in further detail below in combination with the drawings and specific embodiments.

[0035] Reference Figures 1-5 As shown in the figure, a proportional pressure valve with self-adaptive reverse function includes a valve body 1 and a valve core 2 slidingly arranged therein, the valve body 1 is provided with a first outlet 11 and a second outlet 12 penetrating through the inside thereof, the valve core 2 is provided with a flow channel 21 for switching communication between the two outlets by moving, the valve body 1 and the valve core 2 form annular valve cavities 22 in communication with the two outlets respectively, each annular valve cavity 22 is provided with a reverse structure 3, the reverse structure 3 includes a fixed valve sleeve 31 and a rotating valve sleeve 32, the fixed valve sleeve 31 is coaxially arranged in the annular valve cavity 22 and fixedly connected with the valve body 1, the rotating valve sleeve 32 is coaxially sleeved on the fixed valve sleeve 31, the fixed valve sleeve 31 is provided with an inner hole 311, the rotating valve sleeve 32 is provided with an outer hole 321 corresponding thereto, the rotating valve sleeve 32 can rotate relative to the fixed valve sleeve 31, a torsion spring 33 is fixedly connected between the rotating valve sleeve 32 and the fixed valve sleeve 31, under the condition that the inner hole 311 and the outer hole 321 remain coaxial, the torsion spring 33 is in an initial state without external force acting thereon, the rotating valve sleeve 32 is provided with a pressure receiving part 322 on the outside thereof, the pressure receiving part 322 is arranged corresponding to the outlet, when the reverse pressure generated by the reverse flow at the outlet side acts on the pressure receiving part 322, the rotating valve sleeve 32 is in a rotating state, so that the outer hole 321 and the inner hole 311 are misaligned to be closed.

[0036] The valve core 2 and the valve body 1 are provided with a tension spring 23, when the flow channel 21 is in communication with the first outlet 11, the tension spring 23 is in an initial state without pressure, and when the flow channel 21 is in communication with the second outlet 12, the tension spring 23 is in a stretched state.

[0037] The valve body 1 is provided with an electromagnetic driver 24 for driving the valve core 2 to move, and the electromagnetic driver 24 has an electromagnetic push rod 241 abutting against the valve core 2.

[0038] When the proportional pressure valve is in working state, the core action is that the electromagnetic driver 24 drives the valve core 2 to slide axially in the valve body 1 to realize switching of the flow passage 21 and different outlets, and the elastic action of the tension spring 23 is matched to ensure stability of movement of the valve core 2 and reliability of reset. The specific working process is as follows:

[0039] First, in the initial state, it is assumed that the valve core 2 is located at a position for making the flow passage 21 communicate with the first outlet 11. At this time, the electromagnetic driver 24 is not powered, the electromagnetic push rod 241 does not exert a pushing force, and the valve core 2 is kept stable at a preset initial position in the valve body 1. Fluid enters the flow passage 21 inside the valve core 2 from the inlet section, communicates with the annular valve cavity 22 corresponding to the first outlet 11 through the flow passage 21, and then flows to the execution circuit connected with the first outlet 11. Since the flow passage 21 communicates with the first outlet 11 at this time, the fluid flows smoothly, and the system normally supplies pressure.

[0040] When the control system issues a switching instruction to switch the pressure output from the first outlet 11 to the second outlet 12, the electromagnetic driver 24 receives an electric signal, the electromagnetic push rod 241 generates an axial pushing force, and pushes the valve core 2 to move toward the second outlet 12. As the valve core 2 begins to slide, the internal flow passage 21 gradually breaks away from the communication state with the first outlet 11, and approaches the second outlet 12. In this process, the tension spring 23 is gradually stretched and enters a stretched state. As the valve core 2 continues to move, the flow passage 21 is completely disconnected from the first outlet 11. When the valve core 2 reaches the target position and the flow passage 21 completely communicates with the second outlet 12, the electromagnetic push rod 241 maintains the pushing force to position the valve core 2, ensuring stable connection.

[0041] When the valve core 2 is located at any position, the flow passage 21 communicates with the first outlet 11 or the second outlet 12, the fluid flows forward, the torsional spring 33 is in the initial state, the outer hole 321 and the inner hole 311 are coaxially aligned, the fluid flows smoothly, and normal pressure supply is realized.

[0042] However, when the system is subjected to reverse high pressure on one outlet side due to power failure, load mutation or external pressure interference, the reverse flow fluid immediately acts on the pressure receiving part 322 of the rotating valve sleeve 32 at the corresponding outlet to generate a radial pushing force, drives the rotating valve sleeve 32 to rotate against the pre-tightening force of the torsional spring 33. As the rotating valve sleeve 32 rotates, the outer hole 321 thereon gradually misaligns with the inner hole 311 on the fixed valve sleeve 31 until it is completely closed to block the reverse flow medium from entering the valve core 2, thereby realizing rapid flow blocking.

[0043] When the external reverse pressure is eliminated, the torsion spring 33 releases the stored energy, drives the rotary valve sleeve 32 to rotate and reset, the outer hole 321 and the inner hole 311 are re-aligned, and the flow state is restored. The whole reverse prevention process does not need external control and is completely driven by fluid pressure, which is fast in response and reliable in action, and realizes self-adaptive reverse prevention protection.

[0044] Referring to Figures 3-8 As shown, the valve body 1 is provided with a pressure relief channel 221 corresponding to the position of each annular valve cavity 22, and the rotary valve sleeve 32 is provided with a ring plate 323 which is surface-bonded to the inner wall of the annular valve cavity 22, and the ring plate 323 is provided with a pressure relief port 3231. When the pressure relief port 3231 is communicated with the pressure relief channel 221 by rotating the rotary valve sleeve 32, the annular valve cavity 22 is in a pressure relief state, and a first reverse prevention is formed.

[0045] When reverse flow occurs at one outlet side, the reverse pressure acts on the pressure receiving portion 322 of the outer side of the rotary valve sleeve 32, and drives it to rotate relative to the fixed valve sleeve 31. With the rotation of the rotary valve sleeve 32, the ring plate 323 at the end thereof rotates synchronously, and the pressure relief port 3231 which is originally shielded by the ring plate 323 gradually moves to and finally aligns with the pressure relief channel 221 on the valve body 1.

[0046] Once the pressure relief port 3231 is communicated with the pressure relief channel 221, the reverse pressure fluid in the annular valve cavity 22 is rapidly discharged through the channel, and active pressure relief is realized. The pressure inside the annular valve cavity 22 is effectively reduced, and damage to the valve core 2 caused by reverse flow high pressure is avoided, and the normal work of the valve core 2 is affected.

[0047] After the pressure relief is completed, when the external reverse pressure disappears, the torsion spring 33 returns to the initial state, drives the rotary valve sleeve 32 to rotate reversely, the ring plate 323 rotates reversely, the pressure relief port 3231 is re-disengaged from the pressure relief channel 221, and sealing and isolation are realized again, and the system returns to the normal flow state. The whole pressure relief process is automatically triggered by fluid pressure and does not need external intervention, which is fast in response and high in reliability.

[0048] Referring to Figures 3-5 and Figure 9 As shown, the fixed valve sleeve 31 is provided with two sealing rings 312 which are in close contact with the inner wall of the rotary valve sleeve 32, and the outer wall of the fixed valve sleeve 31 and the inner wall of the rotary valve sleeve 32 are respectively provided with ring grooves for embedding the two sealing rings 312, and the two sealing rings 312 are symmetrically arranged on both sides of the inner hole 311, forming a bidirectional sealing interface.

[0049] In the normal flow or reverse flow working condition, the sealing ring 312 realizes the sealing effect between the fixed valve sleeve 31 and the rotary valve sleeve 32.

[0050] By the symmetrical arrangement of the double sealing structure, no matter the fluid is in the forward conduction or the reverse attempt to invade state, a reliable sealing barrier can be formed to effectively prevent fluid leakage between the fixed valve sleeve 31 and the rotating valve sleeve 32. Not only does it improve the sealing reliability of the reverse structure 3, but also prolongs the service life of the rotating valve sleeve 32 under frequent opening and closing conditions, ensuring the long-term stable operation of the normal working condition and the self-adaptive reverse function.

[0051] Referring to Figures 6-10 As shown, the pressure receiving portion 322 is a plate-shaped structure extending along the axial direction of the rotating valve sleeve 32, and the outer shape of the pressure receiving portion 322 is adapted to the inner wall of the annular valve cavity 22.

[0052] The outer contour of the pressure receiving portion 322 is matched according to the shape of the inner wall of the annular valve cavity 22, and the outer side surface is in close contact with the inner wall of the annular valve cavity 22. In the assembled state, the outer side of the pressure receiving portion 322 and the inner wall of the annular valve cavity 22 maintain uniform and close sliding fit without obvious gap, ensuring that the fluid cannot flow around from the side and improving the pressure transmission efficiency.

[0053] When reverse flow occurs at the outlet side, the fluid flowing in the reverse direction directly impacts the plate-shaped surface of the pressure receiving portion 322. Due to its axial extension and the adapted outer shape to the inner wall of the annular valve cavity 22, the pressure receiving portion 322 can effectively intercept and fully receive the instantaneous high pressure of the fluid, converting the fluid pressure into a torque that drives the rotating valve sleeve 32 to rotate around its central axis.

[0054] In the forward flow, the fluid flows out from the flow passage 21 inside the valve core 2, first enters the inner hole 311 on the fixed valve sleeve 31, then passes through the outer hole 321 on the rotating valve sleeve 32 aligned with it, and finally enters the annular valve cavity 22 and flows out from the outlet. During the entire process, the fluid flows from the inside to the outside, and its main flow direction is radially outward. The pressure receiving portion 322 is located on the outer peripheral surface of the rotating valve sleeve 32, and at this time, the fluid has been in a stable pressure diffusion state after passing through the outer hole 321, and the pressure uniformly acts on the valve cavity space, almost forming symmetric static pressure on both sides of the pressure receiving portion 322, and thus cannot form an effective pressure difference or tangential force, so it will not generate a rotating torque on the rotating valve sleeve 32.

[0055] When reverse flow occurs, the fluid flows in the reverse direction from the outlet into the annular valve cavity 22, and its flow direction is from the outside to the inside, first directly impacting the pressure receiving portion 322 on the outer periphery of the rotating valve sleeve 32. The pressure receiving portion 322 is a plate-shaped structure extending along the axial direction and its outer side surface is in close contact with the inner wall of the annular valve cavity 22, forming a protruding baffle facing the incoming flow. At this time, the high-pressure reverse flow acts on the pressure receiving portion 322 immediately after entering the valve cavity, and the backflow surface has not yet been filled with fluid or has a lower pressure, forming a significant pressure difference. The pressure difference is applied at a position deviating from the center of rotation, generating a sufficient tangential torque to drive the rotating valve sleeve 32 to rotate against the resistance of the torsional spring 33.

[0056] Referring to Figures 6-10 As shown, a plurality of first outlets 11 and second outlets 12 are arranged on the valve body 1 at intervals along the circumferential direction thereof, and each rotating valve sleeve 32 is provided with a corresponding pressure receiving portion 322 at a position corresponding to each outlet, and a flow guide area matching the corresponding outlet is formed between each two adjacent pressure receiving portions 322.

[0057] In the forward working state, the fluid enters the flow guide area through the inner hole 311 and the outer hole 321, and then flows out through the corresponding outlet. The flow guide area provides a low-resistance flow path for the fluid, ensuring uniform flow distribution and stable pressure when multiple outlets work simultaneously or alternately.

[0058] At the same time, the existence of the flow guide area also ensures that the pressure receiving portion 322 is only activated when reverse flow occurs in its corresponding outlet, and even if high-pressure reverse flow occurs in one flow guide area, it will drive the rotating valve sleeve 32 to rotate, improving the accuracy and rapid response of the reverse control.

[0059] Referring to Figure 7 , Figure 8 and Figure 10 As shown, a plurality of inwardly extending protrusions 324 are uniformly distributed along the circumferential direction of the inner wall of the rotating valve sleeve 32, and the outer wall of the fixed valve sleeve 31 is provided with an arc-shaped groove 313 coaxial with the annular valve cavity 22 at a position corresponding to each protrusion 324. Each protrusion 324 is respectively slidingly connected in the corresponding arc-shaped groove 313, forming a rotation limiting structure.

[0060] When the rotating valve sleeve 32 rotates relative to the fixed valve sleeve 31, the plurality of protrusions 324 uniformly distributed along the circumferential direction of the inner wall of the rotating valve sleeve 32 will move synchronously, and each protrusion 324 will slide in the arc-shaped groove 313 provided on the outer wall of the fixed valve sleeve 31 and move along the arc-shaped trajectory of the groove. As the rotation continues, the protrusion 324 slides in the arc-shaped groove 313, limiting the rotating valve sleeve 32 to rotate only within the angle range defined by the arc-shaped groove 313, preventing it from continuously rotating and damaging the torsional spring 33.

[0061] When the protrusion 324 slides to the end point of the arc-shaped groove 313 and is blocked by the groove wall, the rotation stops, and at this time the rotating valve sleeve 32 reaches the maximum rotation angle. This ensures that the rotating valve sleeve 32 can stably and controllably close the inner hole 311 in response to the reverse flow pressure.

[0062] The pressure relief port 3231 is an arc-shaped port structure circumferentially formed on the ring plate 323, and the arc length thereof is designed to be greater than the arc length corresponding to the minimum rotation angle required for the rotation valve sleeve 32 to achieve reverse prevention. Therefore, in the initial stage of rotation of the rotation valve sleeve 32, as long as the rotation angle thereof reaches a degree at which the edge of the pressure relief port 3231 is aligned with the edge of the pressure relief passage 221 on the valve body 1, a passage is formed therebetween, and pressure relief is started. This means that the rotation valve sleeve 32 does not need to be completely rotated to the limit position, and as long as the reverse flow pressure is sufficient to drive it to produce a small rotation angle, the pressure relief port 3231 can be opened, and the reverse pressure in the annular valve cavity 22 can be rapidly released.

[0063] Referring to Figure 4 , Figure 5 and Figure 9 , the inner side of the fixed valve sleeve 31 is provided with a ring sleeve 4 sleeved on the valve core 2 and fixedly connected with the valve body 1, and a clamping layer is formed between the fixed valve sleeve 31 and the ring sleeve 4. The clamping layer is provided with a pressure ring 41 and a compression spring 42 fixedly connected therewith. When the pressure ring 41 is positively pressurized, the inner hole 311 is in communication with the flow passage 21, and otherwise, the inner hole 311 is in a closed state, forming a two-stage reverse prevention.

[0064] When the fluid flows in the positive direction from the flow passage 21 of the valve core 2, the pressure acts on the front end of the pressure ring 41, pushes the pressure ring 41 to move to the inside of the clamping layer against the elastic force of the compression spring 42, until the inner hole 311 on the fixed valve sleeve 31 is kept in communication with the flow passage 21 of the valve core 2, and the fluid passes through smoothly, and the system is normally pressurized.

[0065] When the reverse flow occurs at the outlet side, the outer hole 321 is misaligned with the inner hole 311 when the rotation valve sleeve 32 rotates, the flow passage 21 stops pressurizing, the compression spring 42 releases the stored energy, pushes the pressure ring 41 to move reversely, and re-closes the connection between the inner hole 311 and the flow passage 21. On the basis of the first-stage reverse prevention of the rotation valve sleeve 32, the internal flow passage 21 is further blocked, forming a two-stage reverse prevention protection that responds independently.

[0066] Referring to Figure 4 , Figure 5 and Figure 9 , the end of the pressure ring 41 facing the flow passage 21 is provided with a piston 411 in sliding cooperation with the inner wall of the fixed valve sleeve 31 and the outer wall of the ring sleeve 4. The inner wall of the fixed valve sleeve 31 is provided with a step in cooperation with the piston 411, and the step is provided with a sealing ring 412 in close contact with the outer wall of the pressure ring 41. When the piston 411 is in contact with the step, the inner hole 311 is in a fully open state.

[0067] When the fluid enters from the flow passage 21 of the valve core 2 and acts on the front end of the pressure ring 41, the pressure pushes the pressure ring 41 to move to the inside of the clamping layer, and the piston 411 at the front end thereof slides and pushes inward along the gap between the inner wall of the fixed valve sleeve 31 and the outer wall of the ring sleeve 4, compressing the compression spring 42 to store energy. In this process, the piston 411 and the pressure ring 41 as a whole remain stable in guidance and sealing.

[0068] When the pressing ring 41 moves to the set position, the end face of the piston 411 completely matches and contacts with the sealing ring 412 on the step, at this time, the inner hole 311 and the flow channel 21 achieve the maximum alignment, and are in the fully open state. At the same time, the sealing ring 412 on the step is tightly matched with the outer wall of the pressing ring 41, forming a circumferential seal to prevent fluid from leaking from the outer periphery of the pressing ring 41 to the interlayer.

[0069] Referring to Figure 3 , Figure 4 and Figures 6-9 , a plurality of inner holes 311 are arranged on the fixed valve sleeve 31 corresponding to each outlet, and a plurality of outer holes 321 are arranged on the rotating valve sleeve 32 corresponding to each inner hole 311.

[0070] A plurality of inner holes 311 are arranged on the fixed valve sleeve 31 corresponding to each outlet, and a plurality of outer holes 321 are arranged on the rotating valve sleeve 32, which can increase the fluid flow area, improve the flow output capacity per unit time, effectively reduce the pressure loss and flow velocity impact when the fluid passes through, improve the flow uniformity, and reduce cavitation and vibration.

[0071] The symmetrical arrangement of the plurality of holes can also make the hydraulic pressure acting on the rotating valve sleeve 32 more balanced, reduce the eccentric load, and improve the motion stability. In the reverse stopping action, the plurality of outer holes 321 and the inner holes 311 are closed in synchronization and are offset, which enhances the sealing reliability. Even if there is a small gap in a single hole, the remaining holes can still maintain sealing, which improves the reverse stopping safety.

[0072] Referring to Figure 3 , Figure 4 and Figures 6-10 , a plurality of pressure relief channels 221 are arranged on the valve body 1 corresponding to the position of each annular valve chamber 22, and a plurality of pressure relief openings 3231 are arranged on the ring plate 323 corresponding to each pressure relief channel 221.

[0073] When the rotating valve sleeve 32 rotates due to reverse flow, the end ring plate 323 rotates synchronously, and the plurality of pressure relief openings 3231 arranged on the ring plate 323 move, and are aligned and communicated with the plurality of pressure relief channels 221 arranged on the valve body 1 in correspondence, forming a plurality of parallel pressure relief paths.

[0074] The corresponding arrangement of the plurality of pressure relief openings 3231 and the plurality of pressure relief channels 221 improves the pressure relief area and the flow capacity, so that the reverse pressure in the annular valve chamber 22 can be discharged through the plurality of pressure relief channels 221 at the same time in a very short time, which accelerates the pressure relief response speed, effectively avoids the pressure relief delay caused by local blockage or insufficient flow cross section, and enhances the reliability and dynamic performance of the reverse stopping function.

[0075] The present application realizes adaptive response to reverse flow through the cooperation of the rotating valve sleeve 32 and the fixed valve sleeve 31 in the annular valve cavity 22, and the layout of the pressure receiving part 322 and the flow guide area ensures smooth and undisturbed forward flow, and quickly triggers action when reverse flow occurs. The rotating valve sleeve 32 rotates and drives the outer hole 321 and the inner hole 311 to be misaligned and closed, and at the same time, the double sealing ring 312 forms reliable sealing.

[0076] After the rotating valve sleeve 32 rotates, the multiple arc-shaped pressure relief openings 3231 and the pressure relief channel 221 are synchronously opened to realize rapid active pressure relief, prevent pressure accumulation, and improve response speed and safety. At the same time, the flow channel 21 stops supplying pressure after reverse flow occurs, so that the pressure ring 41 realizes the cutting off of the inner hole 311 and the flow channel 21 under the action of the compression spring 42, forms secondary reverse stopping, and enhances the reliability of reverse stopping. The overall structure realizes the effect of rapid reverse stopping without external control, improves the running stability, safety and service life of the proportional pressure valve under frequent pressure fluctuation and complex working conditions.

[0077] The above embodiments only express one or several embodiments of the present application, and the description is more specific and detailed, but it cannot be understood as a limitation on the protection scope of the present application. It should be noted that for ordinary skilled persons in the art, without departing from the concept of the present application, a number of modifications and improvements can be made, which all belong to the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the appended claims.

Claims

1. A proportional pressure valve with self-adaptive reverse function, comprising a valve body and a valve core slidingly arranged in the valve body, the valve body is provided with a first outlet and a second outlet penetrating through the inside of the valve body, the valve core is provided with a flow channel for switching the communication between the two outlets by moving; characterized in that An annular valve cavity is formed between the valve body and the valve core and communicates with the two outlets; Each annular valve cavity is provided with a reverse structure, the reverse structure comprises a fixed sleeve and a rotating sleeve, the fixed sleeve is coaxially arranged in the annular valve cavity and is fixedly connected with the valve body, the rotating sleeve is coaxially arranged on the fixed sleeve; An inner hole is formed in the fixed sleeve, and an outer hole is formed in the rotating sleeve; The rotating sleeve can rotate relative to the fixed sleeve, a torsion spring is fixedly connected between the rotating sleeve and the fixed sleeve, and the torsion spring is in an initial state without external force when the inner hole and the outer hole are coaxial; A pressure receiving portion is arranged on the outer side of the rotating sleeve, and the pressure receiving portion is arranged corresponding to the outlet, when the reverse pressure generated by the reverse flow of the outlet side acts on the pressure receiving portion, the rotating sleeve is in a rotating state, so that the outer hole is misaligned with the inner hole and closed.

2. The proportional pressure valve with self-adaptive anti-reverse function according to claim 1, characterized in that, A plurality of pressure relief channels are arranged on the valve body corresponding to the position of each annular valve cavity, and a ring plate is arranged on the end of the rotating sleeve facing the pressure relief channel and abutting against the inner wall of the annular valve cavity, a pressure relief port is formed in the ring plate, when the rotating sleeve rotates to make the pressure relief port communicate with the pressure relief channel, the annular valve cavity is in a pressure relief state, forming a primary reverse.

3. The proportional pressure valve with self-adapting anti-reverse function according to claim 2, characterized in that, Two sealing rings are arranged on the fixed sleeve and closely contact with the inner wall of the rotating sleeve, the outer wall of the fixed sleeve and the inner wall of the rotating sleeve are respectively provided with ring grooves for embedding the two sealing rings, the two sealing rings are symmetrically arranged on both sides of the inner hole, forming a bidirectional sealing interface.

4. The proportional pressure valve with self-adapting anti-reverse function according to claim 1, characterized in that, The pressure receiving portion is a plate-shaped structure extending along the axial direction of the rotating sleeve, and the shape of the pressure receiving portion is matched with the inner wall of the annular valve cavity.

5. The proportional pressure valve with self-adapting anti-reverse function according to claim 4, characterized in that, A plurality of first outlets and second outlets are arranged on the valve body and are spaced apart along the circumferential direction of the valve body, and one pressure receiving portion is arranged on each rotating sleeve corresponding to the position of each outlet, and a flow guide area matched with the corresponding outlet is formed between each two adjacent pressure receiving portions.

6. The proportional pressure valve with self-adapting anti-reverse function according to claim 5, characterized in that, A plurality of inwardly extending protrusions are uniformly distributed on the inner wall of the rotating sleeve, and an arc-shaped groove coaxial with the annular valve cavity is formed in the outer wall of the fixed sleeve corresponding to the position of each protrusion, each protrusion is slidingly connected in the corresponding arc-shaped groove, forming a rotating limiting structure.

7. The proportional pressure valve with self-adapting anti-reverse function according to claim 1, characterized in that, An annular sleeve is arranged on the inner side of the fixed sleeve and is fixedly connected with the valve body, a clamping layer is formed between the fixed sleeve and the annular sleeve, a compression ring and a compression spring fixedly connected with the compression ring are arranged in the clamping layer, when the compression ring is positively pressed, the inner hole and the flow channel are in communication, otherwise, the inner hole is in a closed state, forming a secondary reverse.

8. The proportional pressure valve with self-adapting anti-reverse function according to claim 7, characterized in that, A piston is arranged on the end of the compression ring facing the flow channel and slidingly matches with the inner wall of the fixed sleeve and the outer wall of the annular sleeve, a step is arranged on the inner wall of the fixed sleeve and matches with the piston, and a sealing ring closely contacts with the outer wall of the compression ring is arranged on the step, when the piston contacts with the step, the inner hole is in a fully open state.

9. The proportional pressure valve with self-adapting anti-reverse function according to claim 5, characterized in that, An inner hole is formed in the fixed sleeve corresponding to each outlet, and an outer hole is formed in the rotating sleeve corresponding to each inner hole.

10. The proportional pressure valve with self-adapting anti-reverse function according to claim 2, characterized in that, A plurality of pressure relief channels are arranged on the valve body corresponding to the position of each annular valve cavity, and a pressure relief port is formed in the ring plate corresponding to each pressure relief channel.

Images